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The navigation message contains the satellite ephemeris , which is a numerical model of the satellite's orbit.
you can compute an ephemeris for any comet that is discovered and plot an accurate finder chart
Timing an occultation to a fraction of a second allows the observed location to be referenced against the predicted position from the computed ephemeris , perhaps leading to an update.
He purchased an ephemeris .
Alternatively, you can use an ephemeris to look up the daily positions, but these are usually more expensive and not really worth buying unless you are going to be tracking other astrological things too.
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